Do more research. A lot of people ditch the whole sequential turbo setup and go single. Why? Horrible torque drop between the first turbo running out of puff and the second one taking over. Like, barely-driveable kind of horrible. As BAC5.2 mentioned, the twin-turbo crap doesn't fit with LHD anyway.
Don't type things you wouldn't dare say to someone's face.
Obligatory 'build thread